Newton’s Laws

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# Newton’s Laws - PowerPoint PPT Presentation

Newton’s Laws. Newton’s First Law. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. This law is often called "the law of inertia". Newton’s First Law (Law of Inertia).

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## Newton’s Laws

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### Newton’s Laws

Newton’s First Law
• Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
• This law is often called "the law of inertia".
Newton’s First Law (Law of Inertia)
• An object at rest will remain at rest unless acted on by an unbalanced force.
• An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Newton’s First Law (Law of Inertia)
• This means that there is a natural tendency of objects to keep on doing what they're doing.
• All objects resist changes in their state of motion.
• In the absence of an unbalanced force, an object in motion will maintain this state of motion.

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Newton’s Second Law
• The relationship between an object's mass m, its acceleration a, and the applied force F
• F = ma.
Newton’s Second Law
• Acceleration is produced when a force acts on a mass.
• The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Newton’s Second Law
• What does this Mean?
Newton’s Second Law
• Everyone unconsciously knows the Second Law.
• Everyone knows that heavier objects require more force to move the same distance as lighter objects.
Newton’s Third Law
• For every action there is an equal and opposite reaction.
Newton’s Third Law
• What does this Mean?
Newton’s Third Law
• This means that for every force there is a reaction force that is equal in size, but opposite in direction.
• That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.